"Plan and Transverse Section of Sir William Thomson's Compass-card. B, Corrector for quadrantal error; C, Box for corrector; a, Aluminium boss; b, Central cap of sapphire; c, Cords connecting rim and boss; d, Magnets; e, Threads connecting magnets; f, Aluminium rim; f, Cords supporting magnets; g,g', Knife edges for gimbals." — Encyclopedia Britannica, 1893

Compass Card

"Plan and Transverse Section of Sir William Thomson's Compass-card. B, Corrector for quadrantal error;…

"Is two feet long, and is common in the Mediterranean and other European waters; its flesh is good, though rather dry; it is caught with long lines, called <em>culters.</em>" &mdash; Goodrich, 1859

Sapphire Gurnard

"Is two feet long, and is common in the Mediterranean and other European waters; its flesh is good,…